2 * Bridge multicast support.
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
13 #include <linux/err.h>
14 #include <linux/if_ether.h>
15 #include <linux/igmp.h>
16 #include <linux/jhash.h>
17 #include <linux/kernel.h>
18 #include <linux/log2.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter_bridge.h>
21 #include <linux/random.h>
22 #include <linux/rculist.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
27 #if IS_ENABLED(CONFIG_IPV6)
30 #include <net/ip6_checksum.h>
33 #include "br_private.h"
35 static void br_multicast_start_querier(struct net_bridge *br);
36 unsigned int br_mdb_rehash_seq;
38 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
40 if (a->proto != b->proto)
44 return a->u.ip4 == b->u.ip4;
45 #if IS_ENABLED(CONFIG_IPV6)
46 case htons(ETH_P_IPV6):
47 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
53 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
55 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
58 #if IS_ENABLED(CONFIG_IPV6)
59 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
60 const struct in6_addr *ip)
62 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
66 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
71 return __br_ip4_hash(mdb, ip->u.ip4);
72 #if IS_ENABLED(CONFIG_IPV6)
73 case htons(ETH_P_IPV6):
74 return __br_ip6_hash(mdb, &ip->u.ip6);
80 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
81 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
83 struct net_bridge_mdb_entry *mp;
86 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
87 if (br_ip_equal(&mp->addr, dst))
94 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
100 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
103 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
104 struct net_bridge_mdb_htable *mdb, __be32 dst)
109 br_dst.proto = htons(ETH_P_IP);
111 return br_mdb_ip_get(mdb, &br_dst);
114 #if IS_ENABLED(CONFIG_IPV6)
115 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
116 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
121 br_dst.proto = htons(ETH_P_IPV6);
123 return br_mdb_ip_get(mdb, &br_dst);
127 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
130 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
133 if (br->multicast_disabled)
136 if (BR_INPUT_SKB_CB(skb)->igmp)
139 ip.proto = skb->protocol;
141 switch (skb->protocol) {
142 case htons(ETH_P_IP):
143 ip.u.ip4 = ip_hdr(skb)->daddr;
145 #if IS_ENABLED(CONFIG_IPV6)
146 case htons(ETH_P_IPV6):
147 ip.u.ip6 = ipv6_hdr(skb)->daddr;
154 return br_mdb_ip_get(mdb, &ip);
157 static void br_mdb_free(struct rcu_head *head)
159 struct net_bridge_mdb_htable *mdb =
160 container_of(head, struct net_bridge_mdb_htable, rcu);
161 struct net_bridge_mdb_htable *old = mdb->old;
168 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
169 struct net_bridge_mdb_htable *old,
172 struct net_bridge_mdb_entry *mp;
173 struct hlist_node *p;
178 for (i = 0; i < old->max; i++)
179 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
180 hlist_add_head(&mp->hlist[new->ver],
181 &new->mhash[br_ip_hash(new, &mp->addr)]);
187 for (i = 0; i < new->max; i++) {
189 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
195 return maxlen > elasticity ? -EINVAL : 0;
198 void br_multicast_free_pg(struct rcu_head *head)
200 struct net_bridge_port_group *p =
201 container_of(head, struct net_bridge_port_group, rcu);
206 static void br_multicast_free_group(struct rcu_head *head)
208 struct net_bridge_mdb_entry *mp =
209 container_of(head, struct net_bridge_mdb_entry, rcu);
214 static void br_multicast_group_expired(unsigned long data)
216 struct net_bridge_mdb_entry *mp = (void *)data;
217 struct net_bridge *br = mp->br;
218 struct net_bridge_mdb_htable *mdb;
220 spin_lock(&br->multicast_lock);
221 if (!netif_running(br->dev) || timer_pending(&mp->timer))
229 mdb = mlock_dereference(br->mdb, br);
231 hlist_del_rcu(&mp->hlist[mdb->ver]);
234 call_rcu_bh(&mp->rcu, br_multicast_free_group);
237 spin_unlock(&br->multicast_lock);
240 static void br_multicast_del_pg(struct net_bridge *br,
241 struct net_bridge_port_group *pg)
243 struct net_bridge_mdb_htable *mdb;
244 struct net_bridge_mdb_entry *mp;
245 struct net_bridge_port_group *p;
246 struct net_bridge_port_group __rcu **pp;
248 mdb = mlock_dereference(br->mdb, br);
250 mp = br_mdb_ip_get(mdb, &pg->addr);
254 for (pp = &mp->ports;
255 (p = mlock_dereference(*pp, br)) != NULL;
260 rcu_assign_pointer(*pp, p->next);
261 hlist_del_init(&p->mglist);
262 del_timer(&p->timer);
263 call_rcu_bh(&p->rcu, br_multicast_free_pg);
265 if (!mp->ports && !mp->mglist &&
266 netif_running(br->dev))
267 mod_timer(&mp->timer, jiffies);
275 static void br_multicast_port_group_expired(unsigned long data)
277 struct net_bridge_port_group *pg = (void *)data;
278 struct net_bridge *br = pg->port->br;
280 spin_lock(&br->multicast_lock);
281 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
282 hlist_unhashed(&pg->mglist))
285 br_multicast_del_pg(br, pg);
288 spin_unlock(&br->multicast_lock);
291 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
294 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
295 struct net_bridge_mdb_htable *mdb;
298 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
305 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
311 mdb->size = old ? old->size : 0;
312 mdb->ver = old ? old->ver ^ 1 : 0;
314 if (!old || elasticity)
315 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
317 mdb->secret = old->secret;
322 err = br_mdb_copy(mdb, old, elasticity);
330 call_rcu_bh(&mdb->rcu, br_mdb_free);
333 rcu_assign_pointer(*mdbp, mdb);
338 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
346 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
351 skb->protocol = htons(ETH_P_IP);
353 skb_reset_mac_header(skb);
356 memcpy(eth->h_source, br->dev->dev_addr, 6);
359 eth->h_dest[2] = 0x5e;
363 eth->h_proto = htons(ETH_P_IP);
364 skb_put(skb, sizeof(*eth));
366 skb_set_network_header(skb, skb->len);
372 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
374 iph->frag_off = htons(IP_DF);
376 iph->protocol = IPPROTO_IGMP;
378 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
379 ((u8 *)&iph[1])[0] = IPOPT_RA;
380 ((u8 *)&iph[1])[1] = 4;
381 ((u8 *)&iph[1])[2] = 0;
382 ((u8 *)&iph[1])[3] = 0;
386 skb_set_transport_header(skb, skb->len);
388 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
389 ih->code = (group ? br->multicast_last_member_interval :
390 br->multicast_query_response_interval) /
391 (HZ / IGMP_TIMER_SCALE);
394 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
395 skb_put(skb, sizeof(*ih));
397 __skb_pull(skb, sizeof(*eth));
403 #if IS_ENABLED(CONFIG_IPV6)
404 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
405 const struct in6_addr *group)
408 struct ipv6hdr *ip6h;
409 struct mld_msg *mldq;
412 unsigned long interval;
414 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
419 skb->protocol = htons(ETH_P_IPV6);
421 /* Ethernet header */
422 skb_reset_mac_header(skb);
425 memcpy(eth->h_source, br->dev->dev_addr, 6);
426 eth->h_proto = htons(ETH_P_IPV6);
427 skb_put(skb, sizeof(*eth));
429 /* IPv6 header + HbH option */
430 skb_set_network_header(skb, skb->len);
431 ip6h = ipv6_hdr(skb);
433 *(__force __be32 *)ip6h = htonl(0x60000000);
434 ip6h->payload_len = htons(8 + sizeof(*mldq));
435 ip6h->nexthdr = IPPROTO_HOPOPTS;
437 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
438 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
443 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
445 hopopt = (u8 *)(ip6h + 1);
446 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
447 hopopt[1] = 0; /* length of HbH */
448 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
449 hopopt[3] = 2; /* Length of RA Option */
450 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
452 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
453 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
455 skb_put(skb, sizeof(*ip6h) + 8);
458 skb_set_transport_header(skb, skb->len);
459 mldq = (struct mld_msg *) icmp6_hdr(skb);
461 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
462 br->multicast_query_response_interval;
464 mldq->mld_type = ICMPV6_MGM_QUERY;
467 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
468 mldq->mld_reserved = 0;
469 mldq->mld_mca = *group;
472 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
473 sizeof(*mldq), IPPROTO_ICMPV6,
476 skb_put(skb, sizeof(*mldq));
478 __skb_pull(skb, sizeof(*eth));
485 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
488 switch (addr->proto) {
489 case htons(ETH_P_IP):
490 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
491 #if IS_ENABLED(CONFIG_IPV6)
492 case htons(ETH_P_IPV6):
493 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
499 static struct net_bridge_mdb_entry *br_multicast_get_group(
500 struct net_bridge *br, struct net_bridge_port *port,
501 struct br_ip *group, int hash)
503 struct net_bridge_mdb_htable *mdb;
504 struct net_bridge_mdb_entry *mp;
505 struct hlist_node *p;
506 unsigned int count = 0;
511 mdb = rcu_dereference_protected(br->mdb, 1);
512 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
514 if (unlikely(br_ip_equal(group, &mp->addr)))
521 if (unlikely(count > br->hash_elasticity && count)) {
523 br_info(br, "Multicast hash table "
524 "chain limit reached: %s\n",
525 port ? port->dev->name : br->dev->name);
527 elasticity = br->hash_elasticity;
530 if (mdb->size >= max) {
532 if (unlikely(max > br->hash_max)) {
533 br_warn(br, "Multicast hash table maximum of %d "
534 "reached, disabling snooping: %s\n",
536 port ? port->dev->name : br->dev->name);
539 br->multicast_disabled = 1;
544 if (max > mdb->max || elasticity) {
547 br_info(br, "Multicast hash table "
549 port ? port->dev->name : br->dev->name);
554 err = br_mdb_rehash(&br->mdb, max, elasticity);
556 br_warn(br, "Cannot rehash multicast "
557 "hash table, disabling snooping: %s, %d, %d\n",
558 port ? port->dev->name : br->dev->name,
574 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
575 struct net_bridge_port *port, struct br_ip *group)
577 struct net_bridge_mdb_htable *mdb;
578 struct net_bridge_mdb_entry *mp;
582 mdb = rcu_dereference_protected(br->mdb, 1);
584 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
590 hash = br_ip_hash(mdb, group);
591 mp = br_multicast_get_group(br, port, group, hash);
592 switch (PTR_ERR(mp)) {
598 mdb = rcu_dereference_protected(br->mdb, 1);
599 hash = br_ip_hash(mdb, group);
606 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
608 return ERR_PTR(-ENOMEM);
612 setup_timer(&mp->timer, br_multicast_group_expired,
615 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
622 struct net_bridge_port_group *br_multicast_new_port_group(
623 struct net_bridge_port *port,
625 struct net_bridge_port_group __rcu *next)
627 struct net_bridge_port_group *p;
629 p = kzalloc(sizeof(*p), GFP_ATOMIC);
635 rcu_assign_pointer(p->next, next);
636 hlist_add_head(&p->mglist, &port->mglist);
637 setup_timer(&p->timer, br_multicast_port_group_expired,
642 static int br_multicast_add_group(struct net_bridge *br,
643 struct net_bridge_port *port,
646 struct net_bridge_mdb_entry *mp;
647 struct net_bridge_port_group *p;
648 struct net_bridge_port_group __rcu **pp;
649 unsigned long now = jiffies;
652 spin_lock(&br->multicast_lock);
653 if (!netif_running(br->dev) ||
654 (port && port->state == BR_STATE_DISABLED))
657 mp = br_multicast_new_group(br, port, group);
664 mod_timer(&mp->timer, now + br->multicast_membership_interval);
668 for (pp = &mp->ports;
669 (p = mlock_dereference(*pp, br)) != NULL;
673 if ((unsigned long)p->port < (unsigned long)port)
677 p = br_multicast_new_port_group(port, group, *pp);
680 rcu_assign_pointer(*pp, p);
681 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
684 mod_timer(&p->timer, now + br->multicast_membership_interval);
689 spin_unlock(&br->multicast_lock);
693 static int br_ip4_multicast_add_group(struct net_bridge *br,
694 struct net_bridge_port *port,
697 struct br_ip br_group;
699 if (ipv4_is_local_multicast(group))
702 br_group.u.ip4 = group;
703 br_group.proto = htons(ETH_P_IP);
705 return br_multicast_add_group(br, port, &br_group);
708 #if IS_ENABLED(CONFIG_IPV6)
709 static int br_ip6_multicast_add_group(struct net_bridge *br,
710 struct net_bridge_port *port,
711 const struct in6_addr *group)
713 struct br_ip br_group;
715 if (!ipv6_is_transient_multicast(group))
718 br_group.u.ip6 = *group;
719 br_group.proto = htons(ETH_P_IPV6);
721 return br_multicast_add_group(br, port, &br_group);
725 static void br_multicast_router_expired(unsigned long data)
727 struct net_bridge_port *port = (void *)data;
728 struct net_bridge *br = port->br;
730 spin_lock(&br->multicast_lock);
731 if (port->multicast_router != 1 ||
732 timer_pending(&port->multicast_router_timer) ||
733 hlist_unhashed(&port->rlist))
736 hlist_del_init_rcu(&port->rlist);
739 spin_unlock(&br->multicast_lock);
742 static void br_multicast_local_router_expired(unsigned long data)
746 static void br_multicast_querier_expired(unsigned long data)
748 struct net_bridge *br = (void *)data;
750 spin_lock(&br->multicast_lock);
751 if (!netif_running(br->dev) || br->multicast_disabled)
754 br_multicast_start_querier(br);
757 spin_unlock(&br->multicast_lock);
760 static void __br_multicast_send_query(struct net_bridge *br,
761 struct net_bridge_port *port,
766 skb = br_multicast_alloc_query(br, ip);
771 __skb_push(skb, sizeof(struct ethhdr));
772 skb->dev = port->dev;
773 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
779 static void br_multicast_send_query(struct net_bridge *br,
780 struct net_bridge_port *port, u32 sent)
783 struct br_ip br_group;
785 if (!netif_running(br->dev) || br->multicast_disabled ||
786 !br->multicast_querier ||
787 timer_pending(&br->multicast_querier_timer))
790 memset(&br_group.u, 0, sizeof(br_group.u));
792 br_group.proto = htons(ETH_P_IP);
793 __br_multicast_send_query(br, port, &br_group);
795 #if IS_ENABLED(CONFIG_IPV6)
796 br_group.proto = htons(ETH_P_IPV6);
797 __br_multicast_send_query(br, port, &br_group);
801 time += sent < br->multicast_startup_query_count ?
802 br->multicast_startup_query_interval :
803 br->multicast_query_interval;
804 mod_timer(port ? &port->multicast_query_timer :
805 &br->multicast_query_timer, time);
808 static void br_multicast_port_query_expired(unsigned long data)
810 struct net_bridge_port *port = (void *)data;
811 struct net_bridge *br = port->br;
813 spin_lock(&br->multicast_lock);
814 if (port->state == BR_STATE_DISABLED ||
815 port->state == BR_STATE_BLOCKING)
818 if (port->multicast_startup_queries_sent <
819 br->multicast_startup_query_count)
820 port->multicast_startup_queries_sent++;
822 br_multicast_send_query(port->br, port,
823 port->multicast_startup_queries_sent);
826 spin_unlock(&br->multicast_lock);
829 void br_multicast_add_port(struct net_bridge_port *port)
831 port->multicast_router = 1;
833 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
834 (unsigned long)port);
835 setup_timer(&port->multicast_query_timer,
836 br_multicast_port_query_expired, (unsigned long)port);
839 void br_multicast_del_port(struct net_bridge_port *port)
841 del_timer_sync(&port->multicast_router_timer);
844 static void __br_multicast_enable_port(struct net_bridge_port *port)
846 port->multicast_startup_queries_sent = 0;
848 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
849 del_timer(&port->multicast_query_timer))
850 mod_timer(&port->multicast_query_timer, jiffies);
853 void br_multicast_enable_port(struct net_bridge_port *port)
855 struct net_bridge *br = port->br;
857 spin_lock(&br->multicast_lock);
858 if (br->multicast_disabled || !netif_running(br->dev))
861 __br_multicast_enable_port(port);
864 spin_unlock(&br->multicast_lock);
867 void br_multicast_disable_port(struct net_bridge_port *port)
869 struct net_bridge *br = port->br;
870 struct net_bridge_port_group *pg;
871 struct hlist_node *p, *n;
873 spin_lock(&br->multicast_lock);
874 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
875 br_multicast_del_pg(br, pg);
877 if (!hlist_unhashed(&port->rlist))
878 hlist_del_init_rcu(&port->rlist);
879 del_timer(&port->multicast_router_timer);
880 del_timer(&port->multicast_query_timer);
881 spin_unlock(&br->multicast_lock);
884 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
885 struct net_bridge_port *port,
888 struct igmpv3_report *ih;
889 struct igmpv3_grec *grec;
897 if (!pskb_may_pull(skb, sizeof(*ih)))
900 ih = igmpv3_report_hdr(skb);
901 num = ntohs(ih->ngrec);
904 for (i = 0; i < num; i++) {
905 len += sizeof(*grec);
906 if (!pskb_may_pull(skb, len))
909 grec = (void *)(skb->data + len - sizeof(*grec));
910 group = grec->grec_mca;
911 type = grec->grec_type;
913 len += ntohs(grec->grec_nsrcs) * 4;
914 if (!pskb_may_pull(skb, len))
917 /* We treat this as an IGMPv2 report for now. */
919 case IGMPV3_MODE_IS_INCLUDE:
920 case IGMPV3_MODE_IS_EXCLUDE:
921 case IGMPV3_CHANGE_TO_INCLUDE:
922 case IGMPV3_CHANGE_TO_EXCLUDE:
923 case IGMPV3_ALLOW_NEW_SOURCES:
924 case IGMPV3_BLOCK_OLD_SOURCES:
931 err = br_ip4_multicast_add_group(br, port, group);
939 #if IS_ENABLED(CONFIG_IPV6)
940 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
941 struct net_bridge_port *port,
944 struct icmp6hdr *icmp6h;
945 struct mld2_grec *grec;
951 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
954 icmp6h = icmp6_hdr(skb);
955 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
956 len = sizeof(*icmp6h);
958 for (i = 0; i < num; i++) {
959 __be16 *nsrcs, _nsrcs;
961 nsrcs = skb_header_pointer(skb,
962 len + offsetof(struct mld2_grec,
964 sizeof(_nsrcs), &_nsrcs);
968 if (!pskb_may_pull(skb,
969 len + sizeof(*grec) +
970 sizeof(struct in6_addr) * ntohs(*nsrcs)))
973 grec = (struct mld2_grec *)(skb->data + len);
974 len += sizeof(*grec) +
975 sizeof(struct in6_addr) * ntohs(*nsrcs);
977 /* We treat these as MLDv1 reports for now. */
978 switch (grec->grec_type) {
979 case MLD2_MODE_IS_INCLUDE:
980 case MLD2_MODE_IS_EXCLUDE:
981 case MLD2_CHANGE_TO_INCLUDE:
982 case MLD2_CHANGE_TO_EXCLUDE:
983 case MLD2_ALLOW_NEW_SOURCES:
984 case MLD2_BLOCK_OLD_SOURCES:
991 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
1001 * Add port to rotuer_list
1002 * list is maintained ordered by pointer value
1003 * and locked by br->multicast_lock and RCU
1005 static void br_multicast_add_router(struct net_bridge *br,
1006 struct net_bridge_port *port)
1008 struct net_bridge_port *p;
1009 struct hlist_node *n, *slot = NULL;
1011 hlist_for_each_entry(p, n, &br->router_list, rlist) {
1012 if ((unsigned long) port >= (unsigned long) p)
1018 hlist_add_after_rcu(slot, &port->rlist);
1020 hlist_add_head_rcu(&port->rlist, &br->router_list);
1023 static void br_multicast_mark_router(struct net_bridge *br,
1024 struct net_bridge_port *port)
1026 unsigned long now = jiffies;
1029 if (br->multicast_router == 1)
1030 mod_timer(&br->multicast_router_timer,
1031 now + br->multicast_querier_interval);
1035 if (port->multicast_router != 1)
1038 if (!hlist_unhashed(&port->rlist))
1041 br_multicast_add_router(br, port);
1044 mod_timer(&port->multicast_router_timer,
1045 now + br->multicast_querier_interval);
1048 static void br_multicast_query_received(struct net_bridge *br,
1049 struct net_bridge_port *port,
1053 mod_timer(&br->multicast_querier_timer,
1054 jiffies + br->multicast_querier_interval);
1055 else if (timer_pending(&br->multicast_querier_timer))
1058 br_multicast_mark_router(br, port);
1061 static int br_ip4_multicast_query(struct net_bridge *br,
1062 struct net_bridge_port *port,
1063 struct sk_buff *skb)
1065 const struct iphdr *iph = ip_hdr(skb);
1066 struct igmphdr *ih = igmp_hdr(skb);
1067 struct net_bridge_mdb_entry *mp;
1068 struct igmpv3_query *ih3;
1069 struct net_bridge_port_group *p;
1070 struct net_bridge_port_group __rcu **pp;
1071 unsigned long max_delay;
1072 unsigned long now = jiffies;
1076 spin_lock(&br->multicast_lock);
1077 if (!netif_running(br->dev) ||
1078 (port && port->state == BR_STATE_DISABLED))
1081 br_multicast_query_received(br, port, !!iph->saddr);
1085 if (skb->len == sizeof(*ih)) {
1086 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1089 max_delay = 10 * HZ;
1093 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1098 ih3 = igmpv3_query_hdr(skb);
1102 max_delay = ih3->code ?
1103 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1109 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
1113 max_delay *= br->multicast_last_member_count;
1116 (timer_pending(&mp->timer) ?
1117 time_after(mp->timer.expires, now + max_delay) :
1118 try_to_del_timer_sync(&mp->timer) >= 0))
1119 mod_timer(&mp->timer, now + max_delay);
1121 for (pp = &mp->ports;
1122 (p = mlock_dereference(*pp, br)) != NULL;
1124 if (timer_pending(&p->timer) ?
1125 time_after(p->timer.expires, now + max_delay) :
1126 try_to_del_timer_sync(&p->timer) >= 0)
1127 mod_timer(&p->timer, now + max_delay);
1131 spin_unlock(&br->multicast_lock);
1135 #if IS_ENABLED(CONFIG_IPV6)
1136 static int br_ip6_multicast_query(struct net_bridge *br,
1137 struct net_bridge_port *port,
1138 struct sk_buff *skb)
1140 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1141 struct mld_msg *mld;
1142 struct net_bridge_mdb_entry *mp;
1143 struct mld2_query *mld2q;
1144 struct net_bridge_port_group *p;
1145 struct net_bridge_port_group __rcu **pp;
1146 unsigned long max_delay;
1147 unsigned long now = jiffies;
1148 const struct in6_addr *group = NULL;
1151 spin_lock(&br->multicast_lock);
1152 if (!netif_running(br->dev) ||
1153 (port && port->state == BR_STATE_DISABLED))
1156 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1158 if (skb->len == sizeof(*mld)) {
1159 if (!pskb_may_pull(skb, sizeof(*mld))) {
1163 mld = (struct mld_msg *) icmp6_hdr(skb);
1164 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1166 group = &mld->mld_mca;
1167 } else if (skb->len >= sizeof(*mld2q)) {
1169 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1173 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1174 if (!mld2q->mld2q_nsrcs)
1175 group = &mld2q->mld2q_mca;
1176 mrc = ntohs(mld2q->mld2q_mrc);
1177 max_delay = mrc ? MLDV2_MRC(mrc) : 1;
1183 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
1187 max_delay *= br->multicast_last_member_count;
1189 (timer_pending(&mp->timer) ?
1190 time_after(mp->timer.expires, now + max_delay) :
1191 try_to_del_timer_sync(&mp->timer) >= 0))
1192 mod_timer(&mp->timer, now + max_delay);
1194 for (pp = &mp->ports;
1195 (p = mlock_dereference(*pp, br)) != NULL;
1197 if (timer_pending(&p->timer) ?
1198 time_after(p->timer.expires, now + max_delay) :
1199 try_to_del_timer_sync(&p->timer) >= 0)
1200 mod_timer(&p->timer, now + max_delay);
1204 spin_unlock(&br->multicast_lock);
1209 static void br_multicast_leave_group(struct net_bridge *br,
1210 struct net_bridge_port *port,
1211 struct br_ip *group)
1213 struct net_bridge_mdb_htable *mdb;
1214 struct net_bridge_mdb_entry *mp;
1215 struct net_bridge_port_group *p;
1219 spin_lock(&br->multicast_lock);
1220 if (!netif_running(br->dev) ||
1221 (port && port->state == BR_STATE_DISABLED) ||
1222 timer_pending(&br->multicast_querier_timer))
1225 mdb = mlock_dereference(br->mdb, br);
1226 mp = br_mdb_ip_get(mdb, group);
1230 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1231 struct net_bridge_port_group __rcu **pp;
1233 for (pp = &mp->ports;
1234 (p = mlock_dereference(*pp, br)) != NULL;
1236 if (p->port != port)
1239 rcu_assign_pointer(*pp, p->next);
1240 hlist_del_init(&p->mglist);
1241 del_timer(&p->timer);
1242 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1243 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1245 if (!mp->ports && !mp->mglist &&
1246 netif_running(br->dev))
1247 mod_timer(&mp->timer, jiffies);
1253 time = now + br->multicast_last_member_count *
1254 br->multicast_last_member_interval;
1258 (timer_pending(&mp->timer) ?
1259 time_after(mp->timer.expires, time) :
1260 try_to_del_timer_sync(&mp->timer) >= 0)) {
1261 mod_timer(&mp->timer, time);
1267 for (p = mlock_dereference(mp->ports, br);
1269 p = mlock_dereference(p->next, br)) {
1270 if (p->port != port)
1273 if (!hlist_unhashed(&p->mglist) &&
1274 (timer_pending(&p->timer) ?
1275 time_after(p->timer.expires, time) :
1276 try_to_del_timer_sync(&p->timer) >= 0)) {
1277 mod_timer(&p->timer, time);
1284 spin_unlock(&br->multicast_lock);
1287 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1288 struct net_bridge_port *port,
1291 struct br_ip br_group;
1293 if (ipv4_is_local_multicast(group))
1296 br_group.u.ip4 = group;
1297 br_group.proto = htons(ETH_P_IP);
1299 br_multicast_leave_group(br, port, &br_group);
1302 #if IS_ENABLED(CONFIG_IPV6)
1303 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1304 struct net_bridge_port *port,
1305 const struct in6_addr *group)
1307 struct br_ip br_group;
1309 if (!ipv6_is_transient_multicast(group))
1312 br_group.u.ip6 = *group;
1313 br_group.proto = htons(ETH_P_IPV6);
1315 br_multicast_leave_group(br, port, &br_group);
1319 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1320 struct net_bridge_port *port,
1321 struct sk_buff *skb)
1323 struct sk_buff *skb2 = skb;
1324 const struct iphdr *iph;
1327 unsigned int offset;
1330 /* We treat OOM as packet loss for now. */
1331 if (!pskb_may_pull(skb, sizeof(*iph)))
1336 if (iph->ihl < 5 || iph->version != 4)
1339 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1344 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1347 if (iph->protocol != IPPROTO_IGMP) {
1348 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
1349 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1353 len = ntohs(iph->tot_len);
1354 if (skb->len < len || len < ip_hdrlen(skb))
1357 if (skb->len > len) {
1358 skb2 = skb_clone(skb, GFP_ATOMIC);
1362 err = pskb_trim_rcsum(skb2, len);
1367 len -= ip_hdrlen(skb2);
1368 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1369 __skb_pull(skb2, offset);
1370 skb_reset_transport_header(skb2);
1373 if (!pskb_may_pull(skb2, sizeof(*ih)))
1376 switch (skb2->ip_summed) {
1377 case CHECKSUM_COMPLETE:
1378 if (!csum_fold(skb2->csum))
1383 if (skb_checksum_complete(skb2))
1389 BR_INPUT_SKB_CB(skb)->igmp = 1;
1390 ih = igmp_hdr(skb2);
1393 case IGMP_HOST_MEMBERSHIP_REPORT:
1394 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1395 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1396 err = br_ip4_multicast_add_group(br, port, ih->group);
1398 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1399 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1401 case IGMP_HOST_MEMBERSHIP_QUERY:
1402 err = br_ip4_multicast_query(br, port, skb2);
1404 case IGMP_HOST_LEAVE_MESSAGE:
1405 br_ip4_multicast_leave_group(br, port, ih->group);
1410 __skb_push(skb2, offset);
1417 #if IS_ENABLED(CONFIG_IPV6)
1418 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1419 struct net_bridge_port *port,
1420 struct sk_buff *skb)
1422 struct sk_buff *skb2;
1423 const struct ipv6hdr *ip6h;
1431 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1434 ip6h = ipv6_hdr(skb);
1437 * We're interested in MLD messages only.
1439 * - MLD has always Router Alert hop-by-hop option
1440 * - But we do not support jumbrograms.
1442 if (ip6h->version != 6 ||
1443 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1444 ip6h->payload_len == 0)
1447 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1451 nexthdr = ip6h->nexthdr;
1452 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1454 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1457 /* Okay, we found ICMPv6 header */
1458 skb2 = skb_clone(skb, GFP_ATOMIC);
1463 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1466 len -= offset - skb_network_offset(skb2);
1468 __skb_pull(skb2, offset);
1469 skb_reset_transport_header(skb2);
1470 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1471 skb_network_header_len(skb2));
1473 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1475 switch (icmp6_type) {
1476 case ICMPV6_MGM_QUERY:
1477 case ICMPV6_MGM_REPORT:
1478 case ICMPV6_MGM_REDUCTION:
1479 case ICMPV6_MLD2_REPORT:
1486 /* Okay, we found MLD message. Check further. */
1487 if (skb2->len > len) {
1488 err = pskb_trim_rcsum(skb2, len);
1494 ip6h = ipv6_hdr(skb2);
1496 switch (skb2->ip_summed) {
1497 case CHECKSUM_COMPLETE:
1498 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1499 IPPROTO_ICMPV6, skb2->csum))
1503 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1506 IPPROTO_ICMPV6, 0));
1507 if (__skb_checksum_complete(skb2))
1513 BR_INPUT_SKB_CB(skb)->igmp = 1;
1515 switch (icmp6_type) {
1516 case ICMPV6_MGM_REPORT:
1518 struct mld_msg *mld;
1519 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1523 mld = (struct mld_msg *)skb_transport_header(skb2);
1524 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1525 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1528 case ICMPV6_MLD2_REPORT:
1529 err = br_ip6_multicast_mld2_report(br, port, skb2);
1531 case ICMPV6_MGM_QUERY:
1532 err = br_ip6_multicast_query(br, port, skb2);
1534 case ICMPV6_MGM_REDUCTION:
1536 struct mld_msg *mld;
1537 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1541 mld = (struct mld_msg *)skb_transport_header(skb2);
1542 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1552 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1553 struct sk_buff *skb)
1555 BR_INPUT_SKB_CB(skb)->igmp = 0;
1556 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1558 if (br->multicast_disabled)
1561 switch (skb->protocol) {
1562 case htons(ETH_P_IP):
1563 return br_multicast_ipv4_rcv(br, port, skb);
1564 #if IS_ENABLED(CONFIG_IPV6)
1565 case htons(ETH_P_IPV6):
1566 return br_multicast_ipv6_rcv(br, port, skb);
1573 static void br_multicast_query_expired(unsigned long data)
1575 struct net_bridge *br = (void *)data;
1577 spin_lock(&br->multicast_lock);
1578 if (br->multicast_startup_queries_sent <
1579 br->multicast_startup_query_count)
1580 br->multicast_startup_queries_sent++;
1582 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1584 spin_unlock(&br->multicast_lock);
1587 void br_multicast_init(struct net_bridge *br)
1589 br->hash_elasticity = 4;
1592 br->multicast_router = 1;
1593 br->multicast_querier = 0;
1594 br->multicast_last_member_count = 2;
1595 br->multicast_startup_query_count = 2;
1597 br->multicast_last_member_interval = HZ;
1598 br->multicast_query_response_interval = 10 * HZ;
1599 br->multicast_startup_query_interval = 125 * HZ / 4;
1600 br->multicast_query_interval = 125 * HZ;
1601 br->multicast_querier_interval = 255 * HZ;
1602 br->multicast_membership_interval = 260 * HZ;
1604 spin_lock_init(&br->multicast_lock);
1605 setup_timer(&br->multicast_router_timer,
1606 br_multicast_local_router_expired, 0);
1607 setup_timer(&br->multicast_querier_timer,
1608 br_multicast_querier_expired, (unsigned long)br);
1609 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1614 void br_multicast_open(struct net_bridge *br)
1616 br->multicast_startup_queries_sent = 0;
1618 if (br->multicast_disabled)
1621 mod_timer(&br->multicast_query_timer, jiffies);
1624 void br_multicast_stop(struct net_bridge *br)
1626 struct net_bridge_mdb_htable *mdb;
1627 struct net_bridge_mdb_entry *mp;
1628 struct hlist_node *p, *n;
1632 del_timer_sync(&br->multicast_router_timer);
1633 del_timer_sync(&br->multicast_querier_timer);
1634 del_timer_sync(&br->multicast_query_timer);
1636 spin_lock_bh(&br->multicast_lock);
1637 mdb = mlock_dereference(br->mdb, br);
1644 for (i = 0; i < mdb->max; i++) {
1645 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1647 del_timer(&mp->timer);
1648 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1653 spin_unlock_bh(&br->multicast_lock);
1655 spin_lock_bh(&br->multicast_lock);
1660 call_rcu_bh(&mdb->rcu, br_mdb_free);
1663 spin_unlock_bh(&br->multicast_lock);
1666 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1670 spin_lock_bh(&br->multicast_lock);
1671 if (!netif_running(br->dev))
1677 del_timer(&br->multicast_router_timer);
1680 br->multicast_router = val;
1690 spin_unlock_bh(&br->multicast_lock);
1695 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1697 struct net_bridge *br = p->br;
1700 spin_lock(&br->multicast_lock);
1701 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1708 p->multicast_router = val;
1711 if (val < 2 && !hlist_unhashed(&p->rlist))
1712 hlist_del_init_rcu(&p->rlist);
1717 del_timer(&p->multicast_router_timer);
1722 br_multicast_add_router(br, p);
1731 spin_unlock(&br->multicast_lock);
1736 static void br_multicast_start_querier(struct net_bridge *br)
1738 struct net_bridge_port *port;
1740 br_multicast_open(br);
1742 list_for_each_entry(port, &br->port_list, list) {
1743 if (port->state == BR_STATE_DISABLED ||
1744 port->state == BR_STATE_BLOCKING)
1747 __br_multicast_enable_port(port);
1751 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1754 struct net_bridge_mdb_htable *mdb;
1756 spin_lock_bh(&br->multicast_lock);
1757 if (br->multicast_disabled == !val)
1760 br->multicast_disabled = !val;
1761 if (br->multicast_disabled)
1764 if (!netif_running(br->dev))
1767 mdb = mlock_dereference(br->mdb, br);
1772 br->multicast_disabled = !!val;
1776 err = br_mdb_rehash(&br->mdb, mdb->max,
1777 br->hash_elasticity);
1782 br_multicast_start_querier(br);
1785 spin_unlock_bh(&br->multicast_lock);
1790 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1794 spin_lock_bh(&br->multicast_lock);
1795 if (br->multicast_querier == val)
1798 br->multicast_querier = val;
1800 br_multicast_start_querier(br);
1803 spin_unlock_bh(&br->multicast_lock);
1808 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1812 struct net_bridge_mdb_htable *mdb;
1814 spin_lock(&br->multicast_lock);
1815 if (!netif_running(br->dev))
1819 if (!is_power_of_2(val))
1822 mdb = mlock_dereference(br->mdb, br);
1823 if (mdb && val < mdb->size)
1839 err = br_mdb_rehash(&br->mdb, br->hash_max,
1840 br->hash_elasticity);
1846 spin_unlock(&br->multicast_lock);